Nikon D3100 D3100 User's Manual - Page 187
DAF-Assist Illumination ACalculating Angle of View
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Lens AF-S VR Zoom-Nikkor 200-400mm f/4G IF-ED AF-S NIKKOR 200-400mm f/4G ED VR II PC-E NIKKOR 24mm f/3.5 ED * * When not shifted or tilted. Zoom position Minimum distance without vignetting 250 mm 2.5 m/8 ft. 2in. 350 mm 2.0 m/6 ft. 7 in. 200 mm 5.0 m/16 ft. 5 in. 250 mm 3.0 m/9 ft. 10 in. 300 mm 2.5 m/8 ft. 2 in. 350-400 mm No vignetting 24 mm 3.0 m/9 ft. 10 in. When used with the AF-S NIKKOR 14-24mm f/2.8G ED, the flash will be unable to light the entire subject at all ranges. D AF-Assist Illumination AF-assist illumination is not available with the following lenses: • AF-S NIKKOR 14-24mm f/2.8G ED • AF-S Zoom-Nikkor 80-200mm f/2.8D IF-ED • AF-S NIKKOR 28-300mm f/3.5-5.6G ED VR • AF-S VR Nikkor 200mm f/2G IF-ED • AF-S DX NIKKOR 55-300mm f/4.5-5.6G ED VR • AF-S VR Zoom-Nikkor 200-400mm f/4G IF-ED • AF-S VR Zoom-Nikkor 70-200mm f/2.8G IF-ED • AF-S NIKKOR 200-400mm f/4G ED VR II • AF-S NIKKOR 70-200mm f/2.8G ED VR II At ranges under 1 m (3 ft. 3 in.), the following lenses may block the AF-assist illuminator and interfere with autofocus when lighting is poor: • AF-S Zoom-Nikkor 17-35mm f/2.8D IF-ED • AF-S VR Zoom-Nikkor 24-120mm f/3.5-5.6G • AF-S DX Zoom-Nikkor 17-55mm f/2.8G IF-ED IF-ED • AF-S DX NIKKOR 18-105mm f/3.5-5.6G ED VR • AF-S NIKKOR 24-120mm f/4G ED VR • AF-S DX VR Zoom-Nikkor 18-200mm f/3.5-5.6G IF-ED • AF-S Zoom-Nikkor 28-70mm f/2.8D IF-ED • AF-S DX NIKKOR 18-200mm f/3.5-5.6G ED VR II • AF-S NIKKOR 85mm f/1.4G • AF-S NIKKOR 24-70mm f/2.8G ED • AF-S VR Micro-Nikkor 105mm f/2.8G IF-ED A Calculating Angle of View The size of the area exposed by a 35mm camera is 36 × 24 mm. The size of the area exposed by the D3100, in contrast, is 23.1 × 15.4 mm, meaning that the angle of view of a 35mm camera is approximately 1.5 times that of the D3100. The approximate focal length of lenses for the D3100 in 35mm format can be calculated by multiplying the focal length of the lens by about 1.5. Picture size (35mm format) (36 × 24 mm) Lens Picture diagonal Picture size (D3100) (23.1 × 15.4 mm) Angle of view (35mm format) Angle of view (D3100) n 171